T3 And T4 Tests: A Closer Look

A thyroid function test is used to check the function of the thyroid gland. It is a blood test used to detect hyperthyroidism or hypothyroidism. The T3 test checks for levels of the hormone triiodothyronine, and the T4 test measures the blood level of the hormone T4, also known as thyroxine. Before we delve into the test itself, let’s talk …